Castles are usually enormous structures requiring strong foundations and the use of heavy construction materials such as stone.

一般来说，城堡是巨大的建筑物，需要打下夯实的地基和使用如石头般坚固的材料。

youdao

The foundations of the city walls were decorated with every kind of precious stone.

城墙的根基是用各样宝石修饰的。

youdao

Paths wander past the stone walls and foundations of a partially restored 600-year-old coastal settlement where people lived off the land.

通过小径，漫步过去，看到的石墙和基金会的部分已经修复大半，这是有着600年历史，这里的人们一直赖以生存的的沿海生活地带。

youdao

These valleys were densely populated in pre-European times and you will see low, stone temples and groups of long-abandoned traditional house foundations.

BBC: Five ways to experience Tahiti's waterfall valleys